First stab at parsing redirecting constructors.

lib/compiler/implementation/scanner/parser.dart

Index: lib/compiler/implementation/scanner/parser.dart
diff --git a/lib/compiler/implementation/scanner/parser.dart b/lib/compiler/implementation/scanner/parser.dart
index 9139d10745f64835214eca4db35f5300fa4c38b6..155390b3fe862b653a289a936fcb887364e49645 100644
--- a/lib/compiler/implementation/scanner/parser.dart
+++ b/lib/compiler/implementation/scanner/parser.dart
@@ -916,7 +916,11 @@ class Parser {
       token = parseIdentifier(token.next);
     }
     token = parseFormalParameters(token);
-    token = parseFunctionBody(token, false);
+    if (optional('=', token)) {
+      token = parseRedirectingFactoryBody(token);
+    } else {
+      token = parseFunctionBody(token, false);
+    }
     listener.endFactoryMethod(start, period, token);
     return token.next;
   }
@@ -991,6 +995,25 @@ class Parser {
     return isBlock ? token.next : token;
   }
 
+  Token parseRedirectingFactoryBody(Token token) {

[ahe, 2012/09/26 10:42:55]

listener.beginFoo

+    // Parses a redirecting factory body "= Some<T>.bar;" into a synthetic
+    //  return new Some<T>.bar()
+    // with no arguments and '=' as token for both return and new.
+    assert('=' === token.stringValue);
+    Token equals = token;
+    token = parseType(token.next);
+    bool named = false;
+    if (optional('.', token)) {
+      named = true;
+      token = parseIdentifier(token.next);
+    }
+    expectSemicolon(token);
+    listener.endArguments(0, null, null);
+    listener.handleNewExpression(equals, named);
+    listener.endReturnStatement(true, equals, token);

[ahe, 2012/09/26 10:42:55]

Just one listener.endFoo.

+    return token;
+  }
+
   Token parseFunctionBody(Token token, bool isExpression) {
     if (optional(';', token)) {
       listener.endFunctionBody(0, null, token);